# SubStandard vs Manual Sync

The clearest difference is in-app purchases: SubStandard at none against Manual Sync's 2. SubStandard also leads on device support (3 vs 1) and iOS requirement (12.0 vs 17.6). Manual Sync's advantage is update cadence (every 2 days vs every 7 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Manual Sync sells 2 in-app purchases, starting at $9.99 per year. SubStandard asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for SubStandard against 5.0 for Manual Sync. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

SubStandard ships an update every 7 months, Manual Sync every 2 days. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | SubStandard | Manual Sync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/substandard/id1513656520/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/manual-sync/id6763876582/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 33 MB | 2 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [iService Ottner Röck](https://appshunter.io/developer/1413717324) | [AeroSync Studio](https://appshunter.io/developer/1888070954) |

## What reviewers say

### SubStandard

[App page](https://appshunter.io/ios/app/substandard/id1513656520)

This aviation utility app simplifies applying cold temperature corrections for altitudes. It allows users to save frequently used altitude sets for rapid retrieval, enhancing efficiency in flight planning.

**Highlights:** Cold temperature corrections, Altitude set storage, Quick access to saved altitudes, Easy to use interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Manual Sync

[App page](https://appshunter.io/ios/app/manual-sync/id6763876582)

Easily transfer annotations and bookmarks between PDF documents. This tool uses precise matching for professionals who update manuals frequently, ensuring notes stay in place. All processing is done locally for enhanced privacy.

**Highlights:** Smart word-based annotation matching, Bookmark hierarchy migration, Split-view manual review, Local device processing, Annual and lifetime subscription options

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ManualSync Annual Premium | $9.99 | per year |
| ManualSync Annual Premium | $24.99 | one-time |


## Frequently asked questions

### Is SubStandard free?

SubStandard is free to download, with no in-app purchases.

### Is Manual Sync free?

Manual Sync is free to download, with in-app purchases available.

### Which has better reviews, SubStandard or Manual Sync?

SubStandard and Manual Sync are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do SubStandard or Manual Sync have ads?

Neither SubStandard nor Manual Sync shows ads.

### Which is updated more often, SubStandard or Manual Sync?

SubStandard ships an update every 7 months, and Manual Sync every 2 days. Most recently, SubStandard was updated on October 6, 2026 and Manual Sync on October 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*